The Defense Facilities Administration Agency has submitted documents tied to bid-rigging allegations over installation of electrical equipment, in response to a request from the Tokyo District Public Prosecutor's Office.

Investigators have determined that major electrical machinery manufacturers won orders from the Tokyo Defense Facility Administration Bureau, based in the city of Saitama, by placing bids averaging 99.2 percent of the supposedly secret project budgets from 2000 to 2004.

The investigators have already searched the offices of the manufacturers and construction materials companies on suspicion of bid-rigging.

Sources said one of the bid-rigging cases is a project to install electrical equipment at the U.S. Yokota Air Base in western Tokyo.

The agency said major electrical equipment manufacturers won 17 orders placed by the bureau between fiscal 2000 and 2004. The lowest winning bid, for a project in fiscal 2004, was 98.8 percent of the planned budget. The winning bids in other years exceeded 99 percent of the planned prices, and in 2003, the average winning bid was 100 percent of the project budget.